package servlet;

import pojo.User;
import service.UserService;

import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;
import java.io.IOException;

@WebServlet(name = "LoginServlet", value = "/login")
public class LoginServlet extends HttpServlet {

    private UserService userService = new UserService();
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //1. 获取用户名和密码
        String username = request.getParameter("username");
        String password = request.getParameter("password");
        //2. 调用service查询
        String rememberMe = request.getParameter("rememberMe");
        User user = userService.login(username, password);
        //3. 判断
        if (user != null) {
            if ("1".equals(rememberMe)){
//                向前端发送cookie记住用户名和密码的信息
                Cookie cookieUsername = new Cookie("username", username);
                Cookie cookiePassword = new Cookie("password", password);
                cookieUsername.setMaxAge(7*24*3600);
                cookiePassword.setMaxAge(7*24*3600);
                response.addCookie(cookieUsername);
                response.addCookie(cookiePassword);
            }else {
//                清除Cookie中已有的用户名和密码
                Cookie cookieUsername = new Cookie("username", null);
                Cookie cookiePassword = new Cookie("password", null);
                cookieUsername.setMaxAge(0);
                cookiePassword.setMaxAge(0);
                response.addCookie(cookieUsername);
                response.addCookie(cookiePassword);
            }
            //登录成功，跳转到查询所有的BrandServlet
            // 将登陆成功后的user对象，存储到session
            HttpSession session = request.getSession();
            session.setAttribute("LOGIN_USER", user);
//            String contextPath = request.getContextPath();
            response.sendRedirect("selectAll");
        } else {
            // 登录失败,
            // 存储错误信息到request
            request.setAttribute("LOGIN_MSG", "用户名或密码错误");
            // 转发到login.jsp
            request.getRequestDispatcher("/login.jsp").forward(request, response);
        }
    }
}

